I'm looking for a fic where crowley was bound by a mob boss to be a bodyguard for his daughter for years. Aziraphale doesn't know where he is until the daughter contacts him.
This sounds like Forget the Devil (when God rolls over) by Unuora (T)
Aziraphale's been waiting for their happy ending. After the failed apocalypse he's been betrayed and terrified, but he's done waiting on God and Satan's gone. This was Aziraphale's perfect chance, and he was going to take it.
Pity that Crowley had to go missing.
(In a game of chess there's a lot more to worry about than just the king.)